(D) $Cu$,$Ag$,and $Au$ are group $11$ elements belonging to the $d$-block. They possess partially filled $d$-orbitals in their common oxidation states

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(D) $Cu$,$Ag$,and $Au$ are group $11$ elements belonging to the $d$-block. They possess partially filled $d$-orbitals in their common oxidation states,which is the characteristic feature of transition elements. Group $11$ metals are also known as coinage metals due to their historical usage in minting coins.